Final answer:
Place the primary area of interest closest to the film to minimize the distance and ensure a sharper image, while using fast films and shielding with lead aprons to protect against radiation exposure.
Step-by-step explanation:
When positioning a patient for a radiograph, make sure to place the primary area of interest closest to the film to minimize the distance between the source of the radiation and the area being imaged. This is important because it ensures a sharper image by reducing the amount of radiation required and, consequently, the exposure time. By using fast films and appropriate shielding, such as a lead apron and shielding for the x-ray tube, the exposure to unnecessary radiation is limited for both the patient and the dental technician. The technician also reduces his or her occupational exposure by standing a few meters away, often behind lead-lined structures.